package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     * @param setmealDTO
     */
    @Transactional
    @Override
    public void saveWithDish(SetmealDTO setmealDTO) {
        //给套餐表插入数据
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        setmealMapper.insert(setmeal);

        //获取生成的套餐id
        Long setmealId = setmeal.getId();

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmealId);
        }

        //给套餐菜品关联表插入数据
        setmealDishMapper.insertBatch(setmealDishes);

    }

    /**
     * 套餐分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //起售中的套餐不能删除
        for (Long id : ids) {
            Setmeal setmeal = setmealMapper.getById(id);
            if (setmeal.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }

        for (Long id : ids) {
            //删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(id);
            //删除套餐表中的数据
            setmealMapper.deleteById(id);
        }

    }

    /**
     * 根据id查询套餐和关联的菜品数据
     * @param id
     * @return
     */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        //查询套餐数据
        Setmeal setmeal = setmealMapper.getById(id);

        //查询套餐和菜品的关联关系
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        //封装数据
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }

    /**
     * 修改套餐并修改套餐和菜品关联关系
     * @param setmealDTO
     */
    @Transactional
    @Override
    public void update(SetmealDTO setmealDTO) {
        //修改套餐
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        setmealMapper.update(setmeal);

        //删除套餐和菜品关联关系
        Long setmealId = setmeal.getId();
        setmealDishMapper.deleteBySetmealId(setmealId);

        //批量插入新套餐和菜品关联关系
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmealId);
        }

        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 套餐起售停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        /**
         * - 起售套餐时，如果套餐内包含停售的菜品，则不能起售
         */
//        List<Long> ids = setmealDishMapper.getDishIdBySetmealId(id);
//
//        if (status == StatusConstant.ENABLE) {
//            for (Long dishId : ids) {
//                Dish dish = dishMapper.getById(dishId);
//                if (dish.getStatus() == StatusConstant.DISABLE) {
//                    throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ENABLE_FAILED);
//                }
//            }
//        }

        if (status == StatusConstant.ENABLE){
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if (dishList != null && dishList.size() > 0) {
                for (Dish dish : dishList) {
                    if (dish.getStatus() == StatusConstant.DISABLE){
                        throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                }
            }
        }


        Setmeal setmeal = Setmeal.builder()
                .status(status)
                .id(id)
                .build();

        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    @Override
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
